Dr. Guillermo J. Pastrana Maisonet, MD
- Part D claims, 2024
- 5,616
- Industry payments
- $6,858
- Affiliated sites
- 1
- Medical group
- 1
- State license
- 1
- Practice address
- 505 Ave Hostos, San Juan, PR 00918-3201
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Pastrana Toledo Medical Group - San Juan (Ave Hostos)
Primary care practice · San Juan, Puerto Rico
Find Dr. Pastrana Maisonet's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Guillermo J. Pastrana Maisonet is a general practice physician in Caguas, Puerto Rico
Dr. Pastrana Maisonet practices at Pastrana Toledo Medical Group - San Juan (Ave Hostos) in San Juan, Puerto Rico.
Dr. Pastrana Maisonet's NPI, 1124307814, was assigned on August 11, 2011. Dr. Pastrana Maisonet holds Puerto Rico license 18300.
- NPI
- 1124307814NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5991976714
- NPI enumeration date
- August 11, 2011
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 44
- Medical school graduation
- 2008
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Guillermo J. Pastrana Maisonet practices in San Juan and Caguas
Dr. Pastrana Maisonet's primary practice is Pastrana Toledo Medical Group - San Juan (Ave Hostos), at 505 Ave Hostos, San Juan, PR 00918-3201. The NPI Registry lists Dr. Pastrana Maisonet's practice address as 2 Cll Baldorioty, Caguas, PR 00727.
- Pastrana Toledo Medical Group - San Juan (Ave Hostos)Primary505 Ave Hostos, San Juan, PR 00918-3201
- NPI Registry address2 Cll Baldorioty, Caguas, PR 00727 · Caguas CountyPhone(787) 902-6631
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. Guillermo J. Pastrana Maisonet is affiliated with 1 site of care and 1 medical group
Dr. Pastrana Maisonet's primary practice is Pastrana Toledo Medical Group - San Juan (Ave Hostos) in San Juan, Puerto Rico. The medical group on file is Pastrana Toledo Medical Group.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Guillermo J. Pastrana Maisonet's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Pastrana Maisonet practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Pastrana Toledo Medical Group - San Juan (Ave Hostos) | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Guillermo J. Pastrana Maisonet is one of 2,604 general practice physicians in Puerto Rico
General practice is Dr. Pastrana Maisonet's primary specialty in the NPI Registry, under taxonomy code 208D00000X. Dr. Pastrana Maisonet is licensed in Puerto Rico.
Specialties and state licenses
- General practice, Puerto RicoPrimary
General practice physicians near Dr. Pastrana Maisonet
Counts of general practice physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Guillermo J. Pastrana Maisonet's patients have a median age of 68
Across all payers, Dmand AI patient panel data puts Dr. Pastrana Maisonet's median patient age at 68, with 75% women.
Dr. Pastrana Maisonet's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 68
Patient panel by sex, all payers
- Women75%
- Men25%
Source: Dmand AI Patient Panel Data
Dr. Guillermo J. Pastrana Maisonet wrote 5,616 Medicare Part D claims in 2024
In 2024, Dr. Pastrana Maisonet wrote 5,616 Medicare Part D claims for 322 patients. 83% of them were for generic drugs. CMS names the drug for 4,982 of them, across 102 drugs with 11 or more claims each, at $475,617 in total drug cost. In 2023, CMS named 4,052 claims across 90 drugs.
Dr. Pastrana Maisonet's Part D claims by kind of drug, 2024
- Generic4,655 claims83%
- Brand-name917 claims16%
- Other44 claims1%
Dr. Pastrana Maisonet's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Pastrana Maisonet's Part D claims, 2024
- Opioids0%20 of 5,616 claims
- Antibiotics2%140 of 5,616 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 4,0522024: 4,98223%
Drugs named by CMS: 102 in 2024, 90 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Guillermo J. Pastrana Maisonet takes part in Medicare
Dr. Pastrana Maisonet accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
For MedTech and pharma teams
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Dr. Guillermo J. Pastrana Maisonet received $6,858 in industry payments from 2016 to 2025
CMS Open Payments shows 145 general payments to Dr. Pastrana Maisonet from 10 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. AstraZeneca Pharmaceuticals LP paid the most, $3,061.
General payments to Dr. Pastrana Maisonet by program year, 2016 to 2025
Companies that paid Dr. Pastrana Maisonet the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Guillermo J. Pastrana Maisonet's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Guillermo J. Pastrana Maisonet
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Guillermo J. Pastrana Maisonet's NPI number?
Dr. Guillermo J. Pastrana Maisonet's NPI number is 1124307814. It was assigned on August 11, 2011, and it is active in the NPI Registry.
What kind of doctor is Dr. Guillermo J. Pastrana Maisonet?
Dr. Guillermo J. Pastrana Maisonet is a general practice physician in Caguas, Puerto Rico. The primary specialty in the NPI Registry is General Practice Physician (taxonomy code 208D00000X).
Where does Dr. Guillermo J. Pastrana Maisonet practice?
Dr. Pastrana Maisonet practices at 505 Ave Hostos, San Juan, PR 00918-3201. Dr. Pastrana Maisonet also practices at 2 Cll Baldorioty, Caguas, PR 00727. Dr. Pastrana Maisonet's primary practice is Pastrana Toledo Medical Group - San Juan (Ave Hostos) in San Juan, Puerto Rico.
What is Dr. Guillermo J. Pastrana Maisonet's medical license number?
Dr. Pastrana Maisonet holds Puerto Rico license 18300.
What medical group is Dr. Guillermo J. Pastrana Maisonet part of?
Dr. Pastrana Maisonet is linked to Pastrana Toledo Medical Group.
Does Dr. Guillermo J. Pastrana Maisonet accept Medicare?
Yes. CMS lists Dr. Pastrana Maisonet as accepting Medicare assignment.
What drugs does Dr. Guillermo J. Pastrana Maisonet prescribe most?
In 2024 Medicare Part D data, Dr. Pastrana Maisonet's most prescribed drugs by claims were Gabapentin, Atorvastatin Calcium and Famotidine.
Has Dr. Guillermo J. Pastrana Maisonet received payments from drug or device companies?
CMS Open Payments shows $6,858 in general payments to Dr. Pastrana Maisonet from 10 companies from 2016 to 2025. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. Guillermo J. Pastrana Maisonet been practicing?
Dr. Pastrana Maisonet graduated from medical school in 2008, 18 years ago.
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